7020 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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7020 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7020 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and running accuracy. This P4A tolerance class bearing is supplied as a matched back-to-back (DB) pair, preloaded to Extra Light (Class A) specifications. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads from both directions simultaneously—making it an ideal choice for high-precision, high-stiffness spindles and machinery where minimal deflection is critical.
7020 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7020 | Standard bore diameter (100 mm) and series designation |
| AC | Angular Contact ball bearing design |
| D | Duplex (two bearings supplied as a matched set) |
| P4A | High precision tolerance class (superior to ABEC-7), including specific running accuracy requirements |
| DB | Back-to-Back mounting arrangement for optimal moment load capacity |
| A | Extra Light preload classification |
7020 ACD/P4ADBA Bearing Structural Features & Performance Benefits
Superior Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and shaft deflection. With a 25° contact angle and high dynamic load rating (28,575 lbf), this bearing is engineered for demanding combined load applications.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio, reduced friction, and superior guidance at high rotational speeds, contributing to the bearing's limiting speed of 15,000 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for applications requiring exceptional rotational accuracy.
Optimized Component Design: Featuring 22 precision-ground chrome steel balls of 15.875 mm diameter, the bearing provides optimal stress distribution and long service life under heavy combined loads.
7020 ACD/P4ADBA Bearing Typical Application Areas
The 7020 ACD/P4ADBA is specifically designed for high-performance machinery requiring extreme precision and rigidity:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Gearboxes - Industrial robotics and automation equipment
- High-Speed Machining Centers - Where minimal thermal growth and high positional accuracy are critical
- Medical Equipment - CT scanners and high-speed dental handpieces
- Aerospace Test Equipment - Precision positioning systems and simulators
